Wrist pin puller



Jan. 12, 1932. D. BAIRD WRIST PIN FULLER Filed Jan. 20, 1930 INVENTOR [ya/76 0.5mm

A 7701a NE )7 Patented Jan. 12, 1932 1,840,382

UNITED STATES PATENT oFncE LYNNE D. BAIRD, OF TULSA, OKLAHOMA WRIST PIN FULLER Application filed January 20, 1930. Serial No. 421,982.

My invention relates to pulling devices, bearing portion 8 at one end, and an attachand more particularly to pullers for removing shank 9 at its other end adapted for snug ing wrist pins from cranks used in well drillprojection through one of the crank openings ing and pumping equipment. 6, the end portions being separated by a col- In drilling and pumping oil wells, power lar flange 10, for limiting projection of the transmitted to a bull Wheel is changed from pin with the outer end of the shank 9 being rotary to reciprocatory motion by acrank screw-threaded to receive a nut 11 for drawand pitman for operating a Walking beam. ing the flange l0 firmly against the outer face It is frequently necessary to vary the length of the crank.

10 of stroke of the walking beam and for this The wrist pin puller, generally designated purpose a radial series of openings are pro- 12, includes a conical collar 13 having an invided in the crank to be selectively used for wardly tapering opening 14; for receiving a receiving the wrist pin. Due to the very close set of slips 15 having outer walls 16 tapered fit of the pin in said openings, imperative for complementary to the inner surface of the 15 smooth operation of the apparatus, it is difficollar, and toothed on their inner surfaces 17 cult to remove the pin for changing the stroke to grip the bearing portion of the pitman of the walking beam and it is the principal obbearing portion of the pin when the puller is ject of my invention to provide a device for applied to the pin as presently described. readily pulling a pin from a wrist pin open- The collar is further provided with brack- 0 i ets l8 terminating in T-shaped foot portions 7 A further object is to so construct a device 19 extending inwardly beyond the inner face of this character that it may be easily reof the collar so that when the foot portions moved from the wrist pin after the pulling engage the outer face of the crank, a space operation. indicated at 20 will be reserved between the In accomplishing these and other objects collar and the flange 10 for a purpose later of my invention, I have provided improved described. details of structure, the preferred form of Notches 21 having tapering walls 22 comwhich is illustrated in the accompanying prising wedge seats are provided in the coldrawings, wherein: lar adjacent each side of the bearing portion 30 Fig. 1 is a perspective view of a wrist pin 8 to cooperate with wedge members 23 havll b d i y invention, and illusing correspondingly tapering walls 24 to entrated as applied to a crank and pin for the gage the Walls 22 of the collar. pulling operation. I When the puller, constructed as described,

Fig. 2 is a central section of the wrist is to be operated for removing a wrist pin 35 i ll d lower d f th ank, th from a crank, the nut is removed from the wrist pin being shown in elevation. pin and thecollar mounted on the bearing Fi 3 i a cross ti on th li 3 3, end of the pm with the foot portions seated Fi gill t ti th w i t i a b i aragainst the face of the crank and spacing tially withdrawn from the crank. the collar from the crank. The slips 15 are Fig. 4 is a detail perspective view of the then mounted on the bearing end 8 within i t i ll i di bl d diti the opening 1 1 of the collar and driven for- Referring more in detail to the drawings: Wardly until they firmly engage the surface 1 designates a bull wheel mounted on a of e pm. crank shaft 2 journaled in bearings 3 on the The wedge members are then inserted in upper ends ofjack posts 4. Keyed to one end the notches 21 and are driven downwardly of the crank shaft is a crank 5 provided with to withdraw the pin from the wrist pin open a radial series of wrist pin openings 6 for se ing 6. After the wrist pin has been removed lectively receiving a wrist pin 7 for operable from the crank, the collar and slips may be connection withawalking beam (not shown). readily dislodged by driving the collar in- 50 The wrist pin is formed to provide a pitman wardly toward the flange on the wrist pin,

this inward movement being made possible by the provision of the space reserved between the collar and the flange 10.

What I claim and desire to secure by Let- 5 ters Patent is: p 7

1. A Wrist pin puller including a collar having a tapered bore, a bracket on the collar including a foot portion extended beyond the inner end of the collar and a Wedge seat m in the bracket adjacent the foot portion, slips seatable in the collar bore, and a Wedge member cooperative with the Wedge seat.

2. A Wrist pin puller including a collar having a tapered bore, brackets on opposite 15 sides of the collar having foot portions eX- tended beyond the inner end of the collar, Wedge seats in the brackets, slips sea-table in the collar bore, and Wedge members cooperative With said seats. I v 3. A Wrist pin puller including a collar having a tapered bore, brackets on opposite si es of the collar having foot portions extended beyond the inner end or" the collar, Wedge seats in the brackets and in the inner end of the collar, slips seatable in the collar bore, and Wedge members cooperative With said seats.

e. In Wrist pin puller for a wrist pin having an outer bearing portion, an inner shank 3: adapted for projection into a crank arm and an intermediate collar adapted for hearing against the face of the crank arm, a collar on the puller having a tapered bore adapted for projection over said bearing portion, brackets on opposite sides of the collar hav ing foot portions projected beyond the inher end of the collar to engage the crank arm and space the collar therefrom, the brackets and collar being cut away to provide wedge 40 seats outwardly of the foot pieces, tapered slips seatable in the collar about the bearing portion of the pin, and Wedge members engageable in said seats and With the crank to drive the pin from the crank. In testimony whereof I affix my signature.

' LYNNE D. BAIRD. 

